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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a2a3e42af3b7559f8a997cfdb6ec621f5b9a34a928299d6aef4ce1ff68ae998c' 
  AND token = '1q4IcrMml8mklp1nMAWNcY3SXksq9NbvZ+J4aGE5PbY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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