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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee5e20e6e09cb22e3d98248b771069606ee455d5188b4c8445565e04ebff2a55' 
  AND token = 'KYan2Gi8aue6xbKGMwz7JkRsbJrgClWow59b34zkJBU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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