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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc5841002cdc6ccf514c10555ec63d3d26e10401303aa5acf76b9a9ff2c0e06a' 
  AND token = 'tkHp2y6oRwWTMicnlsxFL8yQwuic7y9GO1hBCwwQIWE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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