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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8f30f955153cf54190f5766a43575d03b473e8e8854d2579fbee4a4ef177b31f' 
  AND token = 'HH6kWrXRk6L9BKORYN+YxRTKS+Pj8HKMt2uxkH7Ft3Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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