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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2d0df792bf6e03e207555c2d1fd269148337c16744748f8ae324edb669999e62' 
  AND token = 'cgEl/UkQb8Kd9yurNF/feerz+se0EEYyMKKRBwj6l10=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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