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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5a6db0cdeaedcbebb2b337ca0dad3231bc2db6c60924dd8e1e71ef92031b458a' 
  AND token = 'Czq5iXnT4lzYj+UuXQDmCO4WGeh9MELM4BfuJWoIAjU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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