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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '73638f7156f95d9a795b2af6e7573958ee6ff954c7a0d7d5ed7ca27bb65bb73d' 
  AND token = 'NsLU7BVNR+Jet4vmcEIG0l4xCylq/4VZBsVkzB7m9tU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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