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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '203538ddd4134c4cd3520d35f32b5ac80bb1edc0af30b4ec152d1c5b373a8676' 
  AND token = 'YPsDfZF6tEQapG/ha86TCwD5Z1J8iQkWxpKsAm9PsL8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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