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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93d5b7b8ac2df7fc76e228dc56360bb8b3e851fd69a96268679ae024a9a6615d' 
  AND token = 'cTfoSWC5V96DiYSiOudZBNYZ9ckD8wYZQeQG1/LmZ0Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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