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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f4dd5203374005b5c5b3e4a17a02879db3a7dd03beac373d553be42ba7dc438f' 
  AND token = 'WSgKUlweb43kL+K3ABvHJiWb5x7kDRtKy4ffIca4d28=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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