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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94b336999a26094b4889be9e62296ea08fb8eedc61788f05a4b540eca7abb3ad' 
  AND token = 'X2tt7DUtGwtjHSSxZqEZG2Ry255Un2ovhvUaPQIO5uY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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