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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa829580d4fbde20edb4a505f2056c696ab6861b64b0f892e13325e65bbb5e68' 
  AND token = 'WEmh5vQ6gn+7YjvmiFahyEo/+39CQ+NIF4S2UwxknyI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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