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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c140e369e6b6f3cf7a67c525e42b24688e9a5f39b36992dcb6e1decb439c08d8' 
  AND token = 'V3GzGorMvrhqrcoCw2YDMlNm4PM3psqz8aie2zLZuG8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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