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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '518a1fa94408834a4bb96295ab588212dcb49ee2c0e9c8c0a4881c54e6d0e5f2' 
  AND token = 'qGh6RnGnICodW81j3sLzPQBshBGpxPccvRp1luyhhtA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00059

JSON explain

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