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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa7a6de0007869ad36acd238d8e67f90e7a90e17e76eb8bd2ac355536c531b6c' 
  AND token = 'Lr53neU8ikz3xat1jsl54tpx9eemfsEfVrwRsvwkBJY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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