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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5a7775ae0e36defe3d36ef2ab6fc7f639ed49d76b15ccd22993275ef7c7ba41b' 
  AND token = 'QWMaF14bJseN1i0xSYKkwBz62bTgN30Fg4RQmX9mNic=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00126

JSON explain

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