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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f88f0e408e2c7a8fa6315d4f1de1a6c59cbfb1dff220f2996d7d78bd03af8ba9' 
  AND token = '08KqaNb3RmSMSmRMX9u2bjJZJ5XlNxpKQ1yIMZRO+2s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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