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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '25ea37712f5e22c36a9c1c71ebdb59ee8bb8bc513df33ffb56927aab6613a28e' 
  AND token = '6OJPZQaLMURZBFpN2Vlf1mxlSnK3+u8Aamcrdql4Nno=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}