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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b39f10d11664f39915676ac2cdd0a057a37d5c065cb96fd1ff47b65c9ea77e91' 
  AND token = 'Etzz7Z83MAG6AiLumd17otWW8vBWE3AOkf9LcIgwE6A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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