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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '407f4a05de346a553dd806f4184ac81bebf7b6c3fe6d5af5252cbe4df6ad4ddd' 
  AND token = 'AUg6aG9GChvgjHVSyWyTMJzfjK2drcdQabZqMGYLNVo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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