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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '40704d3514e3d8368751c5d3662a0da24f3c2997351660d7b344075d9741dcdf' 
  AND token = 'XMPoK21XaAPgzqgDDUx63QDF0O5GLxEX0n14T50K0qI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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