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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd91eb7cddc06207cb77dcf31bea11066578f181d5fab02f5abe89c1cad65474' 
  AND token = 'n+byD8wh1oc9SrIoTvYVAWz47CiyL1pPjWUoI9DErdU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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