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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '744cced3d93bc5d299d1bf97f67017acfdc00c7712ed6a6fc5d4d48716be8d20' 
  AND token = 'LmKo+De+tEuYrQoUusB2c59R/rcxKikl0oWr47MDECw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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