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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '06dffbc005f1f448bb349310007f2bfd2b848465e954ac00f185c914f0f5c11e' 
  AND token = 'FPYkZmEUnYtCzNO1w4IReBOLrI/0HXo+TYK3mP2OYk4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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