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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '13a0174f95dd89ec263cfcc53f4b8643cd65a15f7a3e7a43b3158427adeb0c46' 
  AND token = 'sJEk5GmYe5C49KS8s21KENXagQdsXN8NIqJDYruJuvk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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