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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f20e79ff2f1d9e416de3420566e109c7a76c45c24e712f7a36a6971c1eb21cc9' 
  AND token = 'VFbBs1oot2xzb899bGupIPN4Q3trw4cQqjfH3Y7bRIo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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