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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '59df8276f2e124978797bc415d12745f5354375697d5959b4922f60cd35442d0' 
  AND token = 'hd2exkdPfBym9GHNkVPyp5+RAYcmmgXopqqsj6qJobM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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