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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '237e1b72f48875d2aa65da774c00374136cf5ba28ac34022a134f149163969c7' 
  AND token = 'OLKJNxvOxNehJ7n1qvhNgI3rgZuxc209lJtY3ZbJwck=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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