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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea6969263016054e5f0de68648e7155e5f2dad747a0b68fce2a9996866bd6c06' 
  AND token = 'uzRwT6Kzrlr7LEVaWKu616cy8DL8hOA1RkCu+ygnO9k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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