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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9c8902173a4cafa0935bc0f701e39960f149102d4e0914116374215c27fc6e9b' 
  AND token = 'ngwzbPBrq22yJjWE7A9YouskKQXP7IiRD+StUfrsCqM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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