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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5aba234c776f5c8db1af89b0e9e2aa1f35d175a5640b980c0334f7f9ebb699ad' 
  AND token = 'LC7/PScOSDeY387jGbWaZHRxmZQM3/nArZQeCimjm5U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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