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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d8e075fdd33b5edb6559c59a01e2d68a5ce06d61688b70ed5d049e181bd19e6' 
  AND token = 'bkjCrNUtsR2wpD5L58NIVMwl82QNclaPY3xvZebZdCE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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