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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '655a68ecb551d416e29df45864416c897d890a3722fbbe05c5b59e92c9ff4151' 
  AND token = 'fqejLxi79ooSgLLgkFZoy01qq5J4pi48TLFbY4IBihg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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