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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '28fce703698b8df3a9f62d019ecb7b291d466ef15c73527a7c02645ba99ea556' 
  AND token = 'r9+ofLt2T5Bt24CgN6Zc9bNfEimkMItRuqXTQ9LbP4I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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