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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a9124693f084213f3b6d5f8ac1218bece700fd06d612e748d4865bf34a34ce0' 
  AND token = 'jGUlG/r3tECXsUY8LxSoiKV1T+5xbHV3H9bzMZLLkc4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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