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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '47facc24e9582485ad90cb37ce369c5b48e4d26ae44b1add9828a47b5b0c8b7b' 
  AND token = '0MWzD51RDL7d3V8Olq9hEdwjMdigmmKxRHwkUleCHR4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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