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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96cc2b2b3028efafdd6eb089e440ced78cb5a16c2b620bfd1e7dc0dd55707aef' 
  AND token = 'i3AQpaiZUPFS3Jh7I6suSktHQN+9j0BYAXYyQlGW2o0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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