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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc8a95d2cfb7f3e420ec3c5d52a8d13c80eea74452d0bea6fa2892230a42dbe9' 
  AND token = 'ExkJOTcJ6Cg++pdkT4AOayiHJC65d6InqKeCnx7g1hk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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