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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '47e722b1824cef9c4c0f964d7e3fd4220714c47b4d900e2bafdee9b253989778' 
  AND token = 'MXsdUEE8mBzwOEAiN4q4ErGvP3b61llBiEexRcLAoio=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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