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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b5e27a238b3236111f1c64f1dd30c5fc6d4dae32425a43c0cf6870bf815414d1' 
  AND token = 'sxst2j159botyWzDi0Zwvle6EYHJyQ3DzzfOt7qG7XA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00058

JSON explain

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