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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf219bcbdcabfbaf14254b43430ae17685a27ffec4bd9cb51a9c41f9fce8ed46' 
  AND token = 'VRg/8rWVnnq6NuF7mF3N2RK1bdfBseX3jar/3PXbwsI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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