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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c3b9b8324cc968afaa6f0c405a16a61b8f1877094dc82a30e2182f5298b9f4f4' 
  AND token = 'SDi71TN2x1JjdJoEYgTvAf6aS2WrNXURJRtw0rzWJsM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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