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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ffe9cb118bf803555395c65ec07577a0b22358afeba98d2ca782737bdd4167f5' 
  AND token = 'kEr9uF3dC/npUsQDYkNDAIAZDRmNnnhgilkkvg8VNW0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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