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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c36d02ab96a25a926c614ffd86a6dc5638e6b356abfad11de8fd28d1053c76bd' 
  AND token = '1xGsu7ZVLQEz7KfrcEqxTG1yWMUT+iAl1U9tChdaGYI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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