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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f18e14ebf2a5c84818390999bbd5edbbf562dfd26b9b5a31f1bd6f0a5b8ec08f' 
  AND token = 'gnmcee2e7F606f/wC5VB2Fv1Z8jHl94WYAj4WhKCOSQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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