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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee73546dca7095e82f990ca860dbedf3ef135036c5a4de84eaec9ec793d7bb9f' 
  AND token = 'DTeiL6tdFB61eWKeZhiKCTysBWX9nF1/kBrw+yr621g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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