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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a5ea914c6972a6e5c3a2a562b9327ee96ca1c5d6392bbefb7852aee27047dc4d' 
  AND token = 'lKcNP95bdQE7CPJebqm6SOkGcfzFie5lFoWWKTlbiIE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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