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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dcd7f9b91110f39901c21194a3b52d980b92ebd0a30c7e0270849d81b6639026' 
  AND token = 'vOjjc4Dk87w8gEhYVZMT8qEEBbvFevCSGuTCy8D4W9A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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