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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eec4e5164835de00b45058b8fa656b2e9a06e734d47391f48a106f0eadb63db1' 
  AND token = 'YCJ1aqrXZSR6ApNnPnBuCAKUSNTldPi5dVTzUann2Dk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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