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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a59c0af67b0b61752febebdf9acffa15b1d3e92fffb61a9f4f8d846c2c2c3f66' 
  AND token = '9e/G2PLMrbBolU4ynk1PbOv8aCHNayMQ0+vST+cG/EY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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