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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '070621b4072eb83d5e19a356f63655c09e9284d7867ce5befebbfa41ad8fd7af' 
  AND token = 'aBHId8HrrGy7oBTHX+xAAR5ISI1fnTlb7XXoDTTtLOI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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