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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4633377f88faa5b8dd62a4d09b9cb739ff5f8c3048147991581dc28ba4ef5a97' 
  AND token = '2bJtzvD4R1iwNDetS16uROaer9aXML2wf7AzBdEFmmg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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