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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6ed805c2977e33ed8bec9113358dbf5d7b857708956291f1e63f7eb3c7092d80' 
  AND token = 'ayZYlaOeDmFXR7gG6KUz3fstdIV5dsO+dwUE5HMhIUA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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