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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f6fc519fb994237292d0f0d18a4f8a65590ad04f45c72e5525336ab07033c24' 
  AND token = 'ZWf6nz7oJlm3VP91iGC8+bVRan0Y9N08S769zNl9e7I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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