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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '289ea07ef7f2d284495b1a7f8f2ef3e446e863cfbe08598880224c06b6847c3b' 
  AND token = '/fkUcSAl7As1f91VnfXQX5AUG9yLK3d7/2jrmXgWmoo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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