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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7be8e268d94692613dd6c10f773f3db9472da2ccf06cc0eece85716f5fb0a96b' 
  AND token = 'hAnunTIuj5Y4l6ZVhRRzbwxdp7yei3vVYD96Zde+zew=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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