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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '390108ba55ad17a4ce3dc874469d1219e51c3a1604d2da5c73ffab873fd89809' 
  AND token = 'QNl+50yLhwjz6kHsyQW0ueiO0DXwHmfOAtVyDHJe1pY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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