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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e948653d58ca7fe1c756d07799f4244df2191b73269846952529e8955cef09fc' 
  AND token = '3bzrpxnSYK3hcFICJdSoMuDQAqOQ9zdz0Foug1MoRIQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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