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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1de0685ebe098a0bb543a1b34429c90e2f41b7ace70221a5919beca8ae0d9a5f' 
  AND token = 'Dd1AHwnm1TADAd0+y4mLeWfyIVxK86o9u0lr4gs+/Y8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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